ANALYSIS OF THE DAMAGE OF FUNCTIONAL BASED ON THE COBALT-RESISTANT ABRASION LAYERS

Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61989100%3A27360%2F15%3A86095752" target="_blank" >RIV/61989100:27360/15:86095752 - isvavai.cz</a>
Result on the web
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DOI - Digital Object Identifier
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Result language
angličtina
Original language name
ANALYSIS OF THE DAMAGE OF FUNCTIONAL BASED ON THE COBALT-RESISTANT ABRASION LAYERS
Original language description
Cobalt-based alloys (e.g. Stellite) are often used on surfaces which are required for the high resistance to abrasion (sealing surfaces of the fittings, etc.). These surface layers are commonly applied to low alloyed steel Grade 22 or martensitic steel Grade 91 by welding techniques using. When using armatures with these layers in energetic plants (high pressure valves) have shown operating experience that occurs in damage to functional layers often. The typical damage is characterized by cracking and flaking (release) of the functional layer. This paper deals with the analysis of the causes of such damage to the surface layer of the ball valves (or their contact faces) after the low-cycle service application in superheated steam (550°C / 10MPa). Layers were applied to the steel AISI 316. For this research were used methods of metallography, chemical and SEM analysis, phase and XRDA microanalysis, hardness and microhardness testing. It was found selective cracking in the areas of a specific phase composition. The subsequently release of materials particles and other damage to the surface by these particles.
Czech name
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Czech description
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Project
<a href="/en/project/LO1203" target="_blank" >LO1203: Regional Materials Science and Technology Centre - Feasibility Program</a><br>
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year
2015
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Article name in the collection
METAL 2015 : 24th International Conference on Metallurgy and Materials : conference proceedings : June 3rd-5th 2015, Hotel Voroněž I, Brno, Czech Republic, EU
ISBN
978-80-87294-62-8
ISSN
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e-ISSN
neuvedeno
Number of pages
7
Pages from-to
1540-1546
Publisher name
Tanger
Place of publication
Ostrava
Event location
Brno
Event date
Jun 3, 2015
Type of event by nationality
WRD - Celosvětová akce
UT code for WoS article
000374706100250

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